Hi The patch dd291d77cc90eb6a86e9860ba8e6e38eebd57d12 (block: Introduce zone write plugging) causes a performance regression when removing block devices. The kernel 6.9 removes a DM block device in 73ms. The kernel 6.10-rc in 103ms. That patch adds a rcu_barrier() call to the disk-removal code path and it causes the slowdown. We get this stacktrace when we attempt to remove large amount of DM devices. Note that the removed devices aren't zoned at all. [<0>] rcu_barrier+0x208/0x320 [<0>] disk_free_zone_resources+0x102/0x160 [<0>] disk_release+0x72/0xe0 [<0>] device_release+0x34/0x90 [<0>] kobject_put+0x8b/0x1d0 [<0>] cleanup_mapped_device+0xd8/0x160 [<0>] __dm_destroy+0x12a/0x1d0 [<0>] dm_hash_remove_all+0x77/0x1a0 [<0>] remove_all+0x23/0x40 [<0>] ctl_ioctl+0x1dc/0x530 [<0>] dm_ctl_ioctl+0xe/0x20 [<0>] __x64_sys_ioctl+0x94/0xd0 [<0>] do_syscall_64+0x82/0x160 [<0>] entry_SYSCALL_64_after_hwframe+0x76/0x7e Mikulas
